<div v-deep v-bind="$attrs">
    <ElButton aria-label="返回上一个页面。" title="返回" @click="back" v-if="closable" style="margin-right: 0.5em;"><ElIcon><ArrowLeft /></ElIcon></ElButton>
    <div style="flex: 1; display: flex; align-items: center; text-overflow: ellipsis; overflow: hidden; white-space: nowrap;"><slot></slot></div>
</div>